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Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]  
Results of discontinued operations
Results of the discontinued operations for the three and six months ended June 30, 2014 were as follows:

In millions
Three Months Ended
 
Six Months Ended
 
June 30, 2014
 
June 30, 2014
Operating revenue
$
212

 
$
798

 
 
 
 
Income before income taxes
$
1,724

 
$
1,796

Income tax expense
(726
)
 
(753
)
Income from discontinued operations
$
998

 
$
1,043